A demonstrator holds a placard during a rally to condemn the killers of the U.S. Ambassador to Libya in Benghazi on Sept. 12, 2012 Photo: REUTERS

A demonstrator holds banner during a rally to condemn the killers of the U.S. Ambassador to Libya in Benghazi on Sept. 12, 2012 Photo: REUTERS

Demonstrator hold a placard during a rally to condemn the killers of the U.S. Ambassador to Libya in Benghazi on Sept. 12, 2012 Photo: REUTERS

A demonstrator holds a message during a rally to condemn the killers of the U.S. Ambassador to Libya in Benghazi on Sept. 12, 2012 Photo: REUTERS

A demonstrator holds a message during a rally to condemn the killers of the U.S. Ambassador to Libya in Benghazi on Sept. 12, 2012 Photo: REUTERS

A demonstrator holds placard during a rally to condemn the killers of the U.S. Ambassador to Libya in Benghazi on Sept. 12, 2012 Photo: REUTERS

U.S. President Barack Obama with Secretary of State Hillary Clinton delivers a statement following the death of the U.S. Ambassador to Libya, Chris Stevens, in the Rose Garden of the White House in Washington on Sept. 12, 2012 Photo: REUTERS

U.S. Republican presidential nominee Mitt Romney makes remarks on the attack on the U.S. consulate in Libya, in Jacksonville, Florida on Sept. 12, 2012 Photo: REUTERS

File photo of Christopher Stevens, the U.S. ambassador to Libya, at a meeting in Tripoli Photo: REUTERS

File photo of Christopher Stevens, the U.S. ambassador to Libya, at his home in Tripoli Photo: Reuters

File photo of Christopher Stevens, the U.S. ambassador to Libya, leaving after a meeting in Tripoli Photo: Reuters

U.S. Ambassador to Libya Christopher Stevens is seen in this undated U.S. State Department photo Photo: Reuters

Libya's PM El-Keib and Head of the national assembly Magarief attend a news conference in Tripoli on Sept. 12, 2012 Photo: REUTERS

An exterior view of the U.S. consulate, which was attacked and set on fire by gunmen, in Benghazi Photo: REUTERS

An interior view of the damage at the U.S. consulate, which was attacked and set on fire by gunmen in Benghazi Photo: REUTERS

The U.S. Consulate in Benghazi is seen in flames during a protest on Sept. 11, 2012 Photo: REUTERS

A protester reacts as the U.S. Consulate in Benghazi is seen in flames on Sept. 11, 2012 Photo: REUTERS

A burning car is seen at the U.S. Consulate in Benghazi during a protest on Sept. 11, 2012 Photo: REUTERS

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Following the death of U.S. ambassador to Libya Chris Stevens, the first killing of a U.S. ambassador in more than 30 years, the U.S. administration has opened an investigation into the incident even as the initial evidence points to the involvement of well-armed thugs rather than an out-of-control mob.

Officials were investigating whether the attack on the U.S. Consulate in Benghazi was a backlash to an alleged anti-Islamic movie -- Innocence Of Muslims -- or a plot to coincide with the anniversary of the 9/11 terror attacks, the Associated Press reported.

President Barack Obama, delivering a statement following the deaths of Stevens, information manager Sean Smith and two other Americans who were not identified, said the U.S. would "work with the Libyan government to bring to justice" the perpetrators.

"We reject all efforts to denigrate the religious beliefs of others, but there is absolutely no justification for this type of senseless violence. None," Obama said, ordering an increased security at the U.S. diplomatic posts abroad, reported the AP.

Republican presidential candidate Mitt Romney accused the Obama administration of showing weakness in the consulate killings, drawing flak from the party members for comments that could be seen as political opportunism.

Obama retorted saying Romney was someone who had a tendency to "shoot first and aim later."

The American Muslim community has condemned the killings of U.S. diplomats, saying violence was not the answer to criticism of their religion.

"We mourn the loss of a champion of freedom," said Imam Mohamed Majid, President of the Indiana-based Islamic Society of North America at a gathering of U.S. Muslim leaders at the National Press Club in Washington Wednesday, the Voice of America reported.

Scores of Libyans flocked the streets Wednesday with signs apologizing to the U.S. and condemning the killings.